[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCHv1 net] xen-netback: use skb to determine number of required guest Rx requests
From: David Vrabel <david.vrabel@xxxxxxxxxx> Date: Thu, 14 Jan 2016 15:18:30 +0000 > - needed = xenvif_rx_ring_slots_needed(queue->vif); > + skb = skb_peek(&queue->rx_queue); > + if (!skb) > + return false; > + > + needed = DIV_ROUND_UP(skb->len, XEN_PAGE_SIZE); > + if (skb_is_gso(skb)) > + needed++; If I am not mistaken, we moved away from this kind of test exactly because it is inaccurate and may under-estimate the needs. It is possible for an N byte SKB to require N segments. Therefore, the: DIV_ROUND_UP(skb->len, XEN_PAGE_SIZE); calculation doesn't cut it. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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